Web tiled layer

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// Copyright 2018 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using System.Collections.Generic;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntime.Samples.LoadWebTiledLayer
{
    [Register("LoadWebTiledLayer")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Web tiled layer",
        category: "Layers",
        description: "Display a tiled web layer.",
        instructions: "Run the sample and a map will appear. As you navigate the map, map tiles will be fetched automatically and displayed on the map.",
        tags: new[] { "OGC", "Open Street Map", "OpenStreetMap", "layer", "stamen.com", "tiled", "tiles" })]
    public class LoadWebTiledLayer : UIViewController
    {
        // Hold references to UI controls.
        private MapView _myMapView;

        // Templated URL to the tile service.
        private const string TemplateUri = "https://stamen-tiles-{subdomain}.a.ssl.fastly.net/watercolor/{level}/{col}/{row}.jpg";

        // List of subdomains for use when constructing the web tiled layer.
        private readonly List<string> _tiledLayerSubdomains = new List<string> {"a", "b", "c", "d"};

        // Attribution string for the Stamen service.
        private readonly string _attribution = "Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under CC BY SA.";

        public LoadWebTiledLayer()
        {
            Title = "Web tiled layer";
        }

        private void Initialize()
        {
            // Create the layer from the URL and the subdomain list.
            WebTiledLayer baseLayer = new WebTiledLayer(TemplateUri, _tiledLayerSubdomains);

            // Create a basemap from the layer.
            Basemap layerBasemap = new Basemap(baseLayer);

            // Apply the attribution for the layer.
            baseLayer.Attribution = _attribution;

            // Show the tiled layer basemap.
            _myMapView.Map = new Map(layerBasemap);
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            _myMapView = new MapView();
            _myMapView.TranslatesAutoresizingMaskIntoConstraints = false;

            // Add the views.
            View.AddSubviews(_myMapView);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _myMapView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _myMapView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _myMapView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _myMapView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }
    }
}